Zeiss, Nikon, Olympus, Zeiss: How do you choose?

To add my two cents - I echo that experiment should come first. If there’s a specific solution that is only offered by one or two vendors, that should weigh heavily. However, in the event that they all have a solution to address your need, consider the local team. They’ll be your training and support life line. it can make the whole difference. Plus all the other comments above!! Good luck!!